The ECA920P6D55BPK from ECHO Microwave is a Band Pass Filter with Frequency 917 to 923 MHz, Insertion Loss 1.6 dB, Rejection 55 dB @ 500 to 880Mhz, Ripple 0.5 dB, Return Loss 18 dB. Tags: Cavity Filter. More details for ECA920P6D55BPK can be seen below.